/*
 * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.imageio.plugins.gif;

import java.util.Arrays;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;

public class GIFStreamMetadataFormat extends IIOMetadataFormatImpl {

  private static IIOMetadataFormat instance = null;

  private GIFStreamMetadataFormat() {
    super(GIFStreamMetadata.nativeMetadataFormatName,
        CHILD_POLICY_SOME);

    // root -> Version
    addElement("Version", GIFStreamMetadata.nativeMetadataFormatName,
        CHILD_POLICY_EMPTY);
    addAttribute("Version", "value",
        DATATYPE_STRING, true, null,
        Arrays.asList(GIFStreamMetadata.versionStrings));

    // root -> LogicalScreenDescriptor
    addElement("LogicalScreenDescriptor",
        GIFStreamMetadata.nativeMetadataFormatName,
        CHILD_POLICY_EMPTY);
    addAttribute("LogicalScreenDescriptor", "logicalScreenWidth",
        DATATYPE_INTEGER, true, null,
        "1", "65535", true, true);
    addAttribute("LogicalScreenDescriptor", "logicalScreenHeight",
        DATATYPE_INTEGER, true, null,
        "1", "65535", true, true);
    addAttribute("LogicalScreenDescriptor", "colorResolution",
        DATATYPE_INTEGER, true, null,
        "1", "8", true, true);
    addAttribute("LogicalScreenDescriptor", "pixelAspectRatio",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);

    // root -> GlobalColorTable
    addElement("GlobalColorTable",
        GIFStreamMetadata.nativeMetadataFormatName,
        2, 256);
    addAttribute("GlobalColorTable", "sizeOfGlobalColorTable",
        DATATYPE_INTEGER, true, null,
        Arrays.asList(GIFStreamMetadata.colorTableSizes));
    addAttribute("GlobalColorTable", "backgroundColorIndex",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);
    addBooleanAttribute("GlobalColorTable", "sortFlag",
        false, false);

    // root -> GlobalColorTable -> ColorTableEntry
    addElement("ColorTableEntry", "GlobalColorTable",
        CHILD_POLICY_EMPTY);
    addAttribute("ColorTableEntry", "index",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);
    addAttribute("ColorTableEntry", "red",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);
    addAttribute("ColorTableEntry", "green",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);
    addAttribute("ColorTableEntry", "blue",
        DATATYPE_INTEGER, true, null,
        "0", "255", true, true);
  }

  public boolean canNodeAppear(String elementName,
      ImageTypeSpecifier imageType) {
    return true;
  }

  public static synchronized IIOMetadataFormat getInstance() {
    if (instance == null) {
      instance = new GIFStreamMetadataFormat();
    }
    return instance;
  }
}
